These 2 Pole 100 Amp circuit breakers will fit panels built by Challenger PL/PM/PMF, Westinghouse, GL, GLC, WL, WIB, Novaline and Cutler-Hammer CPL/CPM. Made from one-piece moulded case construction with a magnetic assembly for reliable short-circuit protection these Type BR breakers, 1" per pole are CSA and UL listed. Rated 120/240V; 10,000 amp interrupting capacity, they measure 3" x 2" x 3".